Hallo, All!


Does anybody know of any problems when using gethostbyaddr() of TCP/IP 2.0
(un64092) in multithreaded programs?

The programmer's reference says that the call returns a pointer to static
data; this might cause problems when multiple calls from different threads
come in very quickly (500+ threads).

The application is a mt www server, and I want to provide the remote host
name to CGI scripts. As soon as I compile the code with ghba() it crashes
when doing that call, but only in multithreaded mode.

I tried to protect this call with a mutex semaphore, but it didn't work
either (and of course I don't want this kind of solution, since this would
be a heavy bottleneck).

Is ghba() threadsafe, do I have another bug in my program, is there another
way to determine the foreign host name besides that specific call?

A preview version of the server can be downloaded from my www page at
http://www.uni-giessen.de/~g087/os2.html.

When the host dw1.hrz.uni-giessen.de (134.176.3.53) is up and responds to
requests on port 80, it is running my server :-)


Tschau...Thomas

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